As a publisher, you won't find a "cashout" button in your account because withdrawals are handled automatically. You'll receive your payment when your settled earnings reach a minimum of $50 for the previous month.
To illustrate, if your settled earnings reach $50 in January, your payment will be automatically processed and sent to you (via PayPal or Cheque) at the end of February. All you need to do is ensure that your payment details are correctly set up, and we'll initiate the payment as soon as it's available. You can configure your payment details by visiting this link: Payment Details Setup.
If you wish to have more control over when you can cash out manually, you can contact Support@rumble.com and request to switch your account to a creator account. Please note that even with manual cashout, you'll still need to have a minimum of $50 or more in earnings to initiate the process.